I had these in another thread . . but will toss them in here as well. Great information.
I also, having changed oil in my own cars for well over 40 years, have never pre-charged an oil filter. I think, perhaps at one time, it had merit. But with the new oils we are now using I wouldn't worry too much.
By the way, during a testing protocol of a new sport bike we filled the motor with good synthetic, ran it until it was hot, drained the oil, restarted the motor and pinned it on redline for an hour. The current crop of synthetics are amazing. I use Amsoil, primarily because they sponsor our AMA Superbike team, but all of them are amazing.
I also sent the samples of the factory oil to both Amsoil and Blackstone testing to get baseline readings on the Focus.
